CHEVROLET MALIBU TURN SIGNALS PROBLEM

2003 Chevrolet Malibu

A starter, the dmb was changed cause car key would turn but car would not start. The turn signals and wipers also does not work, after up above repairs were made the car still regular does not not nor wipers and turn signals. Was told the wires from a non manufactured fried out the steering column mechanisms, {electrical} which includes turn signals and wipers. So now after $800 in repairs caris not fixed. What do I do/ Is it cheaper to repair or trade in? Thank you, I need some advise for a Dear friend.